[automatically translated] The traditional methods of analysis of roundabouts fall in the defect in the presence of organizational schemes of the intersection, in which the geometrical organization, together with the multiplicity of traffic situations and the inclusion in bound contexts, induces driving behavior even very distant from those observable in conventional roundabouts. As evidenced interesting, in particular, the urban environment, where the intersections in roundabout are especially widespread and are characterized by geometric-functional requirements often distant from those of their conventional roundabouts. One of the major obstacles encountered in the analysis of the operating conditions of this type of intersections depends on the same multiplicity of possible patterns and the consequent difficulty in define its operation in a single theoretical model. From these considerations, this article shows the conceptual path followed to analyze the operating conditions of roundabouts unconventional large, for which the models based on the gap-acceptance theory are not directly applicable. On the contrary, the field observations have suggested a theoretical-experimental approach which, while moving from an empirical basis, does not renounce the possibility of generalization offers from theoretical models. The application to a case study will illustrate how to derive the analytical model of capacity starting from the observed data. The results obtained prove to be of particular interest to develop the study of roundabouts in highly constrained contexts, for which the infrastructure of the organization specificity does not allow the analysis of the operating conditions and performance evaluation starting from the methods proposed in the literature, Weighted only partially comparable to those at issue of accommodation.
|Number of pages||16|
|Publication status||Published - 2008|